Thin film nanocarbon composites for supercapacitor applications

Schopf, Dimitri; Es‐Souni, M.

doi:10.1016/j.carbon.2017.01.027

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…The supported porous carbon-MWCNT-nanocomposite films are obtained following the procedure described in the experimental section. The films are approximately 2 µm thick and contain a wide range of pore sizes, from macro- to mesopores [ 28 ]. They are hydrophobic with a reproducible water contact angle (WCA) of approximately 140° (see below).…”

Section: Resultsmentioning

confidence: 99%

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Exploiting Interfacial Effects between Collapsing Bubbles and Nanocarbon/TiN Substrates for the Green Synthesis of Self-Organized Noble Metal and Nanoalloy Nanoparticles

Es‐Souni

2023

Micromachines

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Noble metal nanoparticles and multi-materials thereof are processed on a substrate from aqueous solutions of the metallic ions, precluding any chemical additives/catalysts. The methods reported here take advantage of interactions between collapsing bubbles and the substrate that result in the generation of reducing radicals at the substrate surface and leading to the reduction of the metal ions on those sites, followed by nucleation and growth. Two selected substrates where these phenomena take place are nanocarbon and TiN. By either using ultrasonic radiation of the substrate in ionic solution or quenching the substrate in a solution from temperatures above the Leidenfrost temperature, a high density of nanoparticles of Au, Au/Pt, Au/Pd and Au/Pd/Pt are synthesized on the substrate surface. The sites where the reducing radicals are generated determine the self-assembly of the nanoparticles. The methods yield highly adherent surface films and nanoparticles; they are materials efficient and cost effective because only the surface is modified with costly materials. The formation mechanisms of these green multi-material NPs are described. Outstanding electrocatalytic performances in acidic solutions of methanol and formic acid are demonstrated.

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Section: Resultsmentioning

confidence: 99%

“…Pyrolysis of these films at 550 °C under nitrogen atmosphere yielded porous nanocarbon-MWCNT-nanocomposite films. A detailed process description can be found in our earlier work [ 27 , 28 ].…”

Section: Methodsmentioning

confidence: 99%

Exploiting Interfacial Effects between Collapsing Bubbles and Nanocarbon/TiN Substrates for the Green Synthesis of Self-Organized Noble Metal and Nanoalloy Nanoparticles

Es‐Souni

2023

Micromachines

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“…We believe that by further tuning the deposition parameters in the HiPIMS process, the formation pores can be avoided or increased. In some applications in fact films with large porosity are required [31,32]. Such types of films have higher effective surface area that is desirable for high energy devices.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Density and microstructure of a-C thin films

Kumar

Gupta

Deshpande

et al. 2018

Diamond and Related Materials

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“…In EDLCs, a nonfaradaic charge accumulation occurs at the electrode–electrolyte interface, from which an orders-of-magnitude higher specific power arises compared with that of pseudocapacitive materials (which has a surface-related faradaic reaction). The use of carbon as an EDLC electrode primarily stems from its chemical inertness to many electrolytes in addition to its higher electrical conductivity, processability, and controllable surface properties. , Many activated carbons (ACs) with tailored properties are produced from renewable biomass precursors such as coconut fiber, dry leaves, lotus pollens, corncob, algae, jelly mushrooms, sugar cane bagasse, and so on − with high specific surface area (<3000 m 2 /g) , and charge-storage properties. However, a survey of literature shows a bottleneck in the charge storability of these ACs.…”

Section: Introductionmentioning

confidence: 99%

Void Space Control in Porous Carbon for High-Density Supercapacitive Charge Storage

et al. 2020

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High-density charge (energy) storage under supercapacitive mode requires an electrode that would deliver larger space for charge accumulation and offer a larger electrochemical potential difference at an electrode–electrolyte interface. Porous carbon has been a preferred electrode for commercial supercapacitors; however, its charge storability is much lower than that of state-of-the-art charge-storage devices such as lithium-ion batteries. We show that one of the primary limiting factors is the voids in porous carbon, which do not contribute to the capacitance because their sizes are much larger than the size of the solvated/unsolvated ions in the electrolyte. We partially activate these voids by filling them with a flower-shaped 3D hierarchical pseudocapacitive material (MnCo2O4) by assuming that flower-shaped fillers would provide an additional easily accessible surface for charge adsorption. Less than 10 wt % MnCo2O4 in the porous carbon from palm kernel shells through simple wet impregnation results in a five-fold increase in the charge storability. Laboratory prototypes of symmetric supercapacitors are fabricated using the MnCo2O4-filled carbon electrodes, which show five times higher specific energy than pure carbon and are cycled over 5000 times with >95% capacitance retention. The present strategy of activating the voids by hierarchical 3D nanostructures could be applied to build high-performance energy-storage devices.

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Thin film nanocarbon composites for supercapacitor applications

Cited by 11 publications

References 29 publications

Exploiting Interfacial Effects between Collapsing Bubbles and Nanocarbon/TiN Substrates for the Green Synthesis of Self-Organized Noble Metal and Nanoalloy Nanoparticles

Exploiting Interfacial Effects between Collapsing Bubbles and Nanocarbon/TiN Substrates for the Green Synthesis of Self-Organized Noble Metal and Nanoalloy Nanoparticles

Density and microstructure of a-C thin films

Void Space Control in Porous Carbon for High-Density Supercapacitive Charge Storage

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